Question

假设我有一个类型，其值可以用整数完全表示但具有验证逻辑，并且它将在Web API中返回并被接受。为了保持良好的代码并避免原始的痴迷，我可能会做类似的事情：

public class FiscalPeriod
{
    public FiscalPeriod(int id)
    {
        if (!Validator.IsValidPeriod(id)) 
            throw new ArgumentException($"Invalid fiscal period ID '{id}'", nameof(id));
        Id = id;
    }

    public int Id { get; private set; }
    public override string ToString() => Id.ToString();
    public static implicit operator int(FiscalPeriod period) => period.Id;
}

然后，当Web API调用返回此类型时，它将被序列化为JSON：

"FiscalPeriod" : {"Id": 201601},

是否有办法强迫它序列化为以下内容？

"FiscalPeriod" : 201601,

这样可以更容易地在客户端处理为普通数字？

Answer 1

You can tell Json.Net how to deal with the type using the JsonConverter attribute.

public class ViewModel
{
   public FiscalPeriod FiscalPeriod { get; set; }
}

public class FiscalPeriodConverter : JsonConverter
{
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var fiscalPeriod = value as FiscalPeriod;
        writer.WriteStartObject();
        serializer.Serialize(writer, fiscalPeriod.Id);
        writer.WriteEndObject();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }

    public override bool CanConvert(Type objectType)
    {
        return typeof(FiscalPeriod).IsAssignableFrom(objectType);
    }
}

[JsonConverter(typeof(FiscalPeriodConverter))]
public class FiscalPeriod
{
    public FiscalPeriod(int id)
    {
        if (!Validator.IsValidPeriod(id))
            throw new ArgumentException($"Invalid fiscal period ID '{id}'", nameof(id));
        Id = id;
    }

    public int Id { get; private set; }
    public override string ToString() => Id.ToString();
    public static implicit operator int(FiscalPeriod period) => period.Id;
}

http://www.newtonsoft.com/json/help/html/T_Newtonsoft_Json_JsonConverterAttribute.htm

为非常简单的类调整和简化DataContract序列化？

1 个答案: